Microstructure and the fatigue crack propagation in the dissimilar low alloy/stainless steel GMAW welded joints

Jambor, Michal; Pokorný, Pavel; Trško, Libor; Oplt, Tomáš; Jacková, Martina; Hutař, Pavel

doi:10.1016/j.matchar.2022.112119

Cited by 8 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, more than 20 sets of full-size resonant bending fatigue tests were performed. In general, the reported research results indicate that the girth joint of an SCR has the worst fatigue performance of the entire flexible system, and the reduction in fatigue life is mainly attributed to microstructural inhomogeneity, [10][11][12] stress concentration, [13][14][15][16] welding residual stress, 17,18 and welding defects. 19,20 Generally, the significant microstructural inhomogeneity, higher local stress concentration coefficient, high-value welding residual stress, and the welding defect can severely reduce the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Fatigue testing strategies for the X65 steel catenary riser with small‐scale specimens considering the effect of welding residual stress

Zhang,

Deng,

Liang

et al. 2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

To accurately evaluate the fatigue performance of a full‐scale deep‐water steel catenary riser (SCR) using small‐size specimens, six fatigue testing strategies were explored, considering the effect of welding residual stress. Through a comparison with the full‐scale resonant bending fatigue testing results, the most equivalent strategy using small‐scale specimens was identified. The results indicate that the test strategies applying constant stress underestimated the fatigue life, compared with that of a full‐scale specimen; meanwhile, fatigue life values obtained from the low‐stress ratio testing strategy were higher, particularly in the low‐stress range region. Comparatively, the fatigue lives obtained for the 100 mm‐wide specimens without cutting were higher in the high‐stress range region. The variable‐applied mean stress strategy using the 25 mm‐wide welded joint specimen was the most suitable for equivalence with the full‐scale fatigue testing, with only a 9.7% difference in the fatigue life testing results. The difference between the applied mean stress and the actual transverse welding residual stress under various fatigue testing strategies is the key factor affecting the equivalence of the fatigue testing results.

show abstract

Section: Introductionmentioning

confidence: 99%

Fatigue testing strategies for the X65 steel catenary riser with small‐scale specimens considering the effect of welding residual stress

Zhang,

Deng,

Liang

et al. 2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Welded joints always work in high temperature, high pressure and corrosive environments, which are prone to cause cracks, fractures and explosions after long-time operation [1]. For this reason, the testing and evaluation of welded joints are very important for pressure vessels, piping and other equipment in service.…”

Section: Introductionmentioning

confidence: 99%

Modified Maximum Likelihood Estimation Metal Magnetic Memory Quantitative Identifying Model of Weld Defect Levels Based on Dempster–Shafer Theory

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Metal magnetic memory (MMM) is a nondestructive testing technology based on the magnetomechanical effect, which is widely used in the qualitative detection of stress concentration zones for welded joints. However, there is inevitable residual stress after welding, which brings the bottleneck of quantitative identification between the weld residual stress concentration and the early hidden damage. In order to overcome the bottleneck of quantitative identification of weld defect levels with MMM technology, a modified maximum likelihood estimation (MLE) MMM quantitative identifying model is first proposed. The experimental materials are Q235B welded plate specimens. Fatigue tension experiments were operated to find the MMM feature laws of critical hidden crack by comparing with synchronous X-ray detection results. Six MMM characteristic parameters, which are, ΔHp(x), Gxmax, Zxmax, ΔHp(y), Gymax and Zymax, are extracted corresponding to the normal state, the hidden crack state and the macroscopic crack, respectively. The MLE values of the six parameters are obtained by the kernel density functions with optimized bandwidth from the view of mathematical statistics. Furthermore, the modified MLE MMM quantitative identifying model is established based on D–S theory to overcome the partial overlap of MLE values among different defect levels, of which the uncertainty is as low as 0.3%. The verification result from scanning electron microscopy (SEM) is consistent with the prediction of the modified MLE MMM model, which provides a new method for quantitative identification of weld defect levels.

show abstract

“…[5][6][7][8] However, the production of reliable dissimilar joints should always consider problems arising from the thermal compatibility of materials, metallurgical reactions that occur at the welds, and dissimilar corrosion behavior. 5,[9][10][11] Traditional fusion welding methods are not suitable to join parts differing in chemical composition, crystal structure, and metallurgical properties. 12 On the other hand, solid state welding methods proved to be successfully employed in the serial production of dissimilar joints.…”

Section: Introductionmentioning

confidence: 99%

“…Multi‐material structures play a key role in modern industrial applications, as the possibility to join different materials allows the design of components to be optimized both in terms of operational performance and production costs 1–4 . The welding of dissimilar metals and alloys has increased considerably mainly due to the great benefits that include improvements in design flexibility and cost reduction 5–8 . However, the production of reliable dissimilar joints should always consider problems arising from the thermal compatibility of materials, metallurgical reactions that occur at the welds, and dissimilar corrosion behavior 5,9–11 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] The welding of dissimilar metals and alloys has increased considerably mainly due to the great benefits that include improvements in design flexibility and cost reduction. [5][6][7][8] However, the production of reliable dissimilar joints should always consider problems arising from the thermal compatibility of materials, metallurgical reactions that occur at the welds, and dissimilar corrosion behavior. 5,[9][10][11] Traditional fusion welding methods are not suitable to join parts differing in chemical composition, crystal structure, and metallurgical properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue corrosion behavior of friction‐welded stainless and carbon steel dissimilar joint

Benedetti

Orempuller

Russo

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

This study investigates the fatigue corrosion behavior of direct drive friction welded ASTM A105 and AISI 304L steels joints. Axial fatigue tests were carried out at a stress ratio of R = 0.1 in air and different corrosive environments using a 3D printed environmental test cell. The samples were tested in 3.5%wt NaCl aqueous solution at free corrosion potential (Ecorr) and other two polarization conditions (−0.85 and −1.30 V vs. Ag/AgCl) with the objective to highlight the influence of the cathodic protection and the influence of evolved hydrogen on the fatigue behavior. Fracture analyses were conducted through optical and electron microscopy to identify the possible causes of failure nucleation and the different damage mechanisms dictated by the aggressive environment. Principal results quantify the detrimental effect of the corrosive environment and the positive role played by the cathodic protection. Moreover, a clear differentiation in the failure site and mechanism was observed for the different corrosion fatigue conditions.

show abstract

Microstructure and the fatigue crack propagation in the dissimilar low alloy/stainless steel GMAW welded joints

Cited by 8 publications

References 33 publications

Fatigue testing strategies for the X65 steel catenary riser with small‐scale specimens considering the effect of welding residual stress

Fatigue testing strategies for the X65 steel catenary riser with small‐scale specimens considering the effect of welding residual stress

Modified Maximum Likelihood Estimation Metal Magnetic Memory Quantitative Identifying Model of Weld Defect Levels Based on Dempster–Shafer Theory

Fatigue corrosion behavior of friction‐welded stainless and carbon steel dissimilar joint

Contact Info

Product

Resources

About